This bundle includes four bottles of Hosa D5S-6 CAIG DeoxIT Contact Cleaner 5oz

From Hosa:

DeoxIT is a fast-acting deoxidizing solution designed for use as a general treatment for connectors, contacts, and other metal surfaces. More than a contact cleaner, DeoxIT chemically improves electrical connections.

• Cleans, protects, lubricates, and improves conductivity
• Reduces intermittent connections, arcing, and RFI as well as wear and abrasion
• Safe for use on all metal connectors and contacts and will not harm plastics